TO 40W4 -13-22
FRAME (TRAILER) MAINTENANCE (MODEL WPES-I) - continued.
Repair threads that are damaged and cannot be restored by installing a helical coil insert. The
following gives standard procedures for installation of a helical insert and removal of a previous
installed damaged one.
Installing Helical Coil Insert.
All sizes for tools and helicoils depend on original bolt size. Refer to repair kit.
Using portable electric drill, vernier caliper, and step drill (1); bore out damaged threads (2) to original
Compressed air can blow into the eyes. Wear eye protection. Do not exceed 30
psi (207 kPa) air pressure.
Clean newly bored hole using compressed air.
Coat thread cutting tap (3) with lubricating oil.
Using tap wrench and tap, cut threads until tap bottoms.